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(triggers: **\u002F*.controller.ts, FileInterceptor, Multer, S3, UploadedFile)","ComeOnOliver\u002Fskillshub","ComeOnOliver","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F43215937?v=4","01M6E5JNFECJAAVFE0W7SMWWD2","Haoran Shu","01M6E5JNNDQS7AJZDYFQ8TPZCK",67,"MIT","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fnestjs-file-uploads\u002FSKILL.md",[],[19,20,21,22,23,24,25,26,27,28,29,30,31],"file","file uploads","uploads","nestjs","nestjs file uploads","secure","validation","streaming","s3","controller","use","file handling","triggers","2026-11-10 10:12:30",false,"---\nname: nestjs-file-uploads\ndescription: \"Secure file handling, Validation, and S3 streaming. Use when implementing secure file uploads, validation, or S3 streaming in NestJS. (triggers: **\u002F*.controller.ts, FileInterceptor, Multer, S3, UploadedFile)\"\n---\n\n# File Upload Patterns\n\n## **Priority: P0 (FOUNDATIONAL)**\n\nSecure file upload handling with validation and storage patterns.\n\n- **Magic Bytes**: NEVER trust `content-type` header or file extension.\n  - **Tool**: Use `file-type` or `mmmagic` to verify the actual buffer signature.\n- **Limits**: Set strict `limits: { fileSize: 5000000 }` (5MB) in Multer config to prevent DoS.\n\n## Streaming (Scalability)\n\n- **Memory Warning**: Default Multer `MemoryStorage` crashes servers with large files.\n- **Pattern**: Use **Streaming** for any file > 10MB.\n  - **Library**: `multer-s3` (direct upload to bucket) or `busboy` (raw stream processing).\n  - **Architecture**:\n    1. Client requests Signed URL from API.\n    2. Client uploads directly to S3\u002FGCS (Bypassing API server completely).\n    3. **Pro Tip**: This is the only way to scale file uploads infinitely.\n\n## Processing\n\n- **Async**: Don't process images\u002Fvideos in the HTTP Request.\n- **Flow**:\n  1. Upload file.\n  2. Push `FileUploadedEvent` to Queue (BullMQ).\n  3. Worker downloads, resizes\u002Fconverts, and re-uploads.\n\n\n## Anti-Patterns\n\n- **No content-type trust**: Always verify file magic bytes; MIME header can be spoofed.\n- **No MemoryStorage for large files**: Use streaming or signed URL pattern for files > 10MB.\n- **No synchronous file processing**: Offload image\u002Fvideo work to BullMQ workers via FileUploadedEvent.\n\n## References\n\n- [Implementation Examples](references\u002Fexample.md)\n\n","# File Upload Patterns\n\n## **Priority: P0 (FOUNDATIONAL)**\n\nSecure file upload handling with validation and storage patterns.\n\n- **Magic Bytes**: NEVER trust `content-type` header or file extension.\n  - **Tool**: Use `file-type` or `mmmagic` to verify the actual buffer signature.\n- **Limits**: Set strict `limits: { fileSize: 5000000 }` (5MB) in Multer config to prevent DoS.\n\n## Streaming (Scalability)\n\n- **Memory Warning**: Default Multer `MemoryStorage` crashes servers with large files.\n- **Pattern**: Use **Streaming** for any file > 10MB.\n  - **Library**: `multer-s3` (direct upload to bucket) or `busboy` (raw stream processing).\n  - **Architecture**:\n    1. Client requests Signed URL from API.\n    2. Client uploads directly to S3\u002FGCS (Bypassing API server completely).\n    3. **Pro Tip**: This is the only way to scale file uploads infinitely.\n\n## Processing\n\n- **Async**: Don't process images\u002Fvideos in the HTTP Request.\n- **Flow**:\n  1. Upload file.\n  2. Push `FileUploadedEvent` to Queue (BullMQ).\n  3. Worker downloads, resizes\u002Fconverts, and re-uploads.\n\n\n## Anti-Patterns\n\n- **No content-type trust**: Always verify file magic bytes; MIME header can be spoofed.\n- **No MemoryStorage for large files**: Use streaming or signed URL pattern for files > 10MB.\n- **No synchronous file processing**: Offload image\u002Fvideo work to BullMQ workers via FileUploadedEvent.\n\n## References\n\n- [Implementation Examples](references\u002Fexample.md)\n\n",{"name":5,"description":7},"main","def8531e65114c0fca8fb8551c1871ee0eed705c","skills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fnestjs-file-uploads",24,"https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub","https:\u002F\u002Fskillshub.wtf","https:\u002F\u002Fgithub.com\u002FComeOnOliver","AI & Blockchain Engineer\r\n","2026-06-24 22:07:19",{"source":8,"skillName":5,"commands":47,"prompt":57,"zipAvailable":58},[48,51,54],{"tool":49,"command":50},"npx","npx skills add ComeOnOliver\u002Fskillshub --skill nestjs-file-uploads",{"tool":52,"command":53},"bunx","bunx skills add ComeOnOliver\u002Fskillshub --skill nestjs-file-uploads",{"tool":55,"command":56},"pnpm","pnpm dlx skills add ComeOnOliver\u002Fskillshub --skill nestjs-file-uploads","安装技能，技能地址：https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fnestjs-file-uploads\u002FSKILL.md",true,[],[61,75,85,94,100,107],{"skillNo":62,"name":63,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":64,"categories":65,"keywords":71,"publishedAt":32},"01M6FKJN13GMG4KY57J3QD8GY5","model-hierarchy-skill","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzscole\u002Fmodel-hierarchy-skill\u002Fmodel-hierarchy-skill\u002FSKILL.md",[66],{"categoryNo":67,"categoryName":68,"taxonomyType":69,"taxonomyTypeDesc":70},"01JBSEEDCAT000000000000023","Skill与智能体开发","SCENARIO","使用场景",[72,73,74],"model","model hierarchy","model hierarchy skill",{"skillNo":76,"name":77,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":78,"categories":79,"keywords":81,"publishedAt":32},"01M6FKJJJ6GCAMR4PPPRD12M5X","zoom-mcp","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fzoom-mcp\u002FSKILL.md",[80],{"categoryNo":67,"categoryName":68,"taxonomyType":69,"taxonomyTypeDesc":70},[82,83,84],"MCP","zoom","zoom mcp",{"skillNo":86,"name":87,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":88,"categories":89,"keywords":90,"publishedAt":32},"01M6FKJE3KYT3KPEZMEEHYKA6K","zoom-apps-sdk","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fzoom-apps-sdk\u002FSKILL.md",[],[91,92,93,83],"sdk","zoom apps sdk","apps",{"skillNo":95,"name":96,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":97,"categories":98,"keywords":99,"publishedAt":32},"01M6FKJ9EDH9Q5VWDF8HAJRSP0","windows","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwindows\u002FSKILL.md",[],[96],{"skillNo":101,"name":102,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":103,"categories":104,"keywords":106,"publishedAt":32},"01M6FKJ666BEEFC3AE9GJ72Q93","whiteboard","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwhiteboard\u002FSKILL.md",[105],{"categoryNo":67,"categoryName":68,"taxonomyType":69,"taxonomyTypeDesc":70},[102],{"skillNo":108,"name":109,"nameZh":6,"description":6,"descriptionZh":6,"repositoryFullName":8,"ownerLogin":9,"ownerAvatarUrl":10,"ownerAccountNo":11,"ownerDisplayName":12,"repositoryNo":13,"starsCount":14,"licenseSpdxId":15,"licenseFileUrl":6,"sourceHtmlUrl":110,"categories":111,"keywords":112,"publishedAt":32},"01M6FKJ21WFCDGTJQ2Q91T9DVW","websockets","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002Fzoom\u002Fskills\u002Fwebsockets\u002FSKILL.md",[],[109]]